That sounds like one of the older ASP engines.

Normally, the best way to drill a propdriver that is slightly conical, is to first mark the location with a centre punch (give it a good whack with the hammer, so you have a deep pit that will prevent the drill from "walking away"), then start the hole by using a 1,5 or 2 mm dril, and IMPORTANT: use a freehand drill, perpendicular to the surface where you want to drill the hole, and ONLY drill a very shallow hole (no more than 1 mm deep). Repeat that with increasing larger drills until you have the drill size you need, but always just ONLY drill until the tip of the drill is in.

Once you have that done, you have a good starting point for the drill, so now you can use the drill press and make the final hole, perpendicular to the propdriver, and drill to full depth,

Please let me know if this description is clear to understand.

If not, I will try to make a few pictures, but I will need time for that...